6. Charles Koch (tie) -- Along with brother David, Charles is co-owner and executive vice president of Koch Industries, the second-largest privately held company in the U.S. He's worth an estimated $42.9 billion.

6. David Koch (tie) -- The billionaire is co-owner (with older brother Charles) and an executive vice president of Koch Industries, a conglomerate that is the second-largest privately held company in the U.S. He's worth an estimated $42.9 billion.

1. Bill Gates -- Gates, co-founder of Microsoft Corp., is also co-chairman of the Bill & Melinda Gates Foundation. His net worth is more than $79.2 billion.

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